Officials say a welfare check of the room was done at about 3 p.m. Friday after the couple didn't show up for a tour of the Grand Canyon. That's when police discovered the couple both dead of multiple stab wounds.

"We're early on in the investigation and at this time we have not been able to determine if it's a murder-suicide or if it's a double homicide investigation," Las Vegas Metropolitan Police Department Lt. Ray Spencer said at a press conference. "So we do not know at this point."

Spencer says police are "leaning" toward the incident being a murder-suicide, but that they won't know for sure until the coroner's examination.